[英]drop down list values not showing
這是我在網頁上遇到的一個非常奇怪的問題。 我目前有一個下拉列表,使用perl和javascript填充了來自數據庫的數據,但該下拉列表未顯示我從數據庫接收的值。
我目前擁有的代碼如下:
my $dataX = ${ConnectToDatabase($main::edsUGCar, $main::databaseEnv)};
$resultSet = $dataX->Execute("select vendor from dex_vendor_info group by vendor");
my @list_of_vendors;
while(!$resultSet->EOF) {
push @list_of_vendors, $resultSet->Fields("vendor")->Value;
$resultSet->MoveNext;
}
$list_of_vendors_json = encode_json(\@list_of_vendors);
print <<ONE;
<html>
<body>
<h4> Test Vendor Array Javascript </h4>
<p id="demo"</p>
<form id="myForm">
<select id="selectNumber">
<option>Choose a Vendor</option>
<script type="text/javascript" language="JavaScript">
var list_of_vendors = $list_of_vendors_json;
var select = document.getElementById("selectNumber");
for(var i = 0; i < list_of_vendors.length; i++) {
var opt = list_of_vendors[i];
var el = document.createElement("option");
el.text = opt;
el.value = opt;
select.appendChild(el);
}
</script>
</select>
</form>
</body>
</html>
ONE
當我檢查下拉列表元素時,輸出的HTML源顯示:
<SELECT id=selectNumber> <OPTION selected>Choose a Vendor</OPTION>
<SCRIPT language=JavaScript type=text/javascript>
var list_of_vendors = ["3D Systems","3DSystems","3M"];
var select = document.getElementById("selectNumber");
for(var i = 0; i < list_of_vendors.length; i++) {
var opt = list_of_vendors[i];
var el = document.createElement("option");
el.text = opt;
el.value = opt ;
select.appendChild(el);
}
</SCRIPT>
<OPTION value="3D Systems"></OPTION> # Info Missing here after the `>`
<OPTION value="3DSystems"></OPTION>
<OPTION value="3M></OPTION>
</SELECT>
您是否嘗試過將腳本移出選擇標簽? DTD(HTML 4)指出選擇標簽具有以下結構:
<!ELEMENT SELECT - - (OPTGROUP|OPTION)+ -- option selector -->
這基本上意味着您不能省略開始或結束<select>
標記,並且<select>
標記只能包含<optgroup>
或<option>
標記 ,其他都不能(沒有<script>
)
在此部分中:
<script type="text/javascript">
var list_of_vendors = $list_of_vendors_json;
var select = document.getElementById("selectNumber");
for(var i = 0; i < list_of_vendors.length; i++) {
var opt = list_of_vendors[i];
var el = document.createElement("OPTION");
el.appendChild(document.createTextNode(opt));
<-這行代碼丟失了!
el.text = opt
el.value = opt
select.appendChild(el);
}
</script>
感謝CannibalGorilla的建議...感謝。
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